Improved lathe-chuck



temat.4 tatmt Mix-a.

NSO Ni J UD'S ON, OF BR O OK L-Y N, N E Y O R K.V

Lm'rs'PawtNo. sama-'dead December 8,1868.

HEPRVED LATHE-CHUCK.

Specificationof certain Improvements in Chucks for Lathes, Planing-Machines, &c., invented by ANSON JImsON, of Brooklyn, in the county of Kings, and State of New York.

Nature'and Object o fthlnventon.,

In the previous construction adopted in the manna facture of chucks, the resolution of the force between the power applied and the resistance'encountered as' the chuck was drawn up, has had a tendency to throw the article chucked awayfrom the face-plate of the lathe', or the bed of the planer or Shaping-machine, which tendency has rendered itvery difiicult to keep articles being chucked snugly to the face-plate or bed, and consequently difiicult to' secure them truly-in poi sition.

My invention consists in the construction of the jaws of the chnck, and the nuts or their equivalent by which said .jaws-'arel connected. to the screws or other device by which these jaws are operated, in two parts,

`so connected to'each other thatfthe action of the' nut or its equivalent upon the jaw of the chuck shall have a tendency to Vkeep the Vwork snuglyto the face-plate or'bed,instead of crowding it therefi'om, substantially as herein more fully set forth.

Desm'iption of the accmnpnyng Draw'ings.

Figure 1 is aface view of a lathe-chuck, embodying my improvement, in which figure each jaw of `the chuck is represented as being operatedby anindef .pendent screw.. q

Figure. 2 is a side view of the same.

Figure 3 is a central'axial section of the same.

,Figura 4- is a detail view, showing a construction suitableto be adopted' in what is known as the scroll'- chuck. This figure gives a side view of .one of the jaws of nthe chuck, and'of the 'device by which said jaw is connected to the scroll.

Figure '5 shows a'l back-side view of the piece shown in fig. 4, for connecting the jaw to-'the Scroll.

Figure 6 is a'side view of a jaw, nut, and screw adapted to be usedupon a planing or shaping-machine, and may also, perhaps, be used upon someforms of lathe-chucks.

` Figure 7 is an end view1of the same. v

General Description.

A represents the face-plate or frame of the chnck, which face-plate or frame is of similar construction to that usual in the construction'of the common chuckwith independent screws. It is Vprovided with T-shaped' i grooves to receive the nuts. B by which the jaws'- O are operated.

The nuts B' are made in similar form of cross-section to that usual for the inner part of the jaw through which the screw passes 'in the ordinary chuck; but the part which connects with the jaw is made to dovetail into it, as shown in figs. 3, 4, and 6, in. such a manner that when the force of the screw is applied in' chucking' the article to be secured, the pressure of this dove'- tail-'portion of the nut will have a tendency to draw the jaw down snugly upon the face-plate or bed,.and vthus prevent the work from being forced away from said face-plate or bed.

The jaw O is-formed with two projections or hooks extending down into-the face-plate, and embracing the dovetail portion of the nut, as shownlin figs. 3, 4, and

6; and in fig.-3 the screw D, by which the nut, and.

consequently the' jaw, are operated, passes through these inwardly-projecting parts of the jaw, but these parts are not threaded so as to form any nut, the screw beingallowed to slide freely through them.

In figs. 6 and 7 the screw D is placed below these parts of the jaw, and does not pass through them, while in figs. 4. and 5 the nut or block Bis represented as being constructed with threads onits' inner side, adapted: to the Scroll-plate which is often used in `the construction of' lathe-chucks.

The effect'of makingthe nut and jaw in two parts, and so constructing them that the nut shall work'upon inclined surfaces upon the jaw, as herein described, is that the jaw is, in the act of' chucking the work, always drawn inward, so as to bear truly against the faceplate instead of thechucking-end of the said `jaw, being ynaturally thrownout'fi'om the face-plate by the .action of the screw; consequently the work which is being chucked is never driven away fi'om the face-plate, but is always held firmly thereto.

It is' obvious that the angle of these surfaces 'o f contact between the parts Band O may be varied as the caprice of the manufacturer, or the particularuses for'which the difl'erent individual chucks may be in'- tended, may dictate., o'r the forms of these surfaces' somewhatmodified, as, for example, by making them curved instead of straight, without essentially affecting the operation or changing the nature of the device; and it' is even very possible that'the two parts, B and C, might be connected by links instead of inclined planes, and made vto successfully embody this invention, and -accomplish its purposeand design; but I do not recommend this latter` construction.

v v Ola/im.

I claim, as my invention, the improvement in chucks herein described; that is to say-,

Making the jaw O and the nut B, or its equivalent, in. two or more parts, instead of in a-single piece, as has formerly'been done, and so combining these parts that vthe action of the part B upon the part O shall draw the Iatter snugly to the face-plate or'bed, substan'tially as' hereinbefore. set forth.

` ANSON JUDSON.

Witnesses: w

LUoIUs W. How, Tnos. B. How'.' 

